摘要
板料激光弯曲成形是一种利用激光成形工件的柔性成形技术。研究激光成形过程中板料变形与扫描路径之间的关系对该技术的应用尤为重要。文章以板料激光扫描成形过程为研究对象,对激光曲线扫描中较为普遍的正弦路径进行了有限元模拟分析。结果表明,在相同工艺参数下,正弦扫描时,光斑在板料边缘停留时间相对较长,温度峰值攀升更为迅速;由于板料成形中只受热应力作用,变形区域的形状、大小与扫描路径有关。由于约束的影响,正弦扫描成形时,板料加热区表现为一个半径较大的圆弧状区域,并且由于板料中间部位受到的刚端抑制作用相对较大,使两端产生翘曲。随着弦高的减小,翘曲现象减轻,渐呈准直线。
Laser forming is a highly flexible sheet metal forming technique. It＇ s important to investigate the relationship between the distortion and process route. In this paper, the FEM is used to simulate the laser sine forming of sheet metal. The results show that the peak temperature values of laser sine scanning rise more rapidly with the same processing parameters. The shape and size of the distortional area are related to the scanning path. A circinal zone with large radius can represent the heated area of sheet. The warped phenomenon is mitigated when the chordal height decreases.
出处
《制造技术与机床》
CSCD
北大核心
2007年第3期35-38,共4页
Manufacturing Technology & Machine Tool
关键词
激光弯曲
板料
扫描路径
有限元模拟
Laser Bending
Sheet Metal
Process Route
FEM Simulation
